Who says Investors are overestimating the Risk of Losing ?have you hold some DATA  about these issue ? because as far as i Know investors are not tend to KEEP HOLDING but instead they are making Money inside the platform so they Sell High and Buy Low .
aside from those who really intended to Buy bitcoin for their Future Usage so they can stand Holding the coins no matter how the value moves .
remember that we have our own strategy in investing so don't just count according to what others do.